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Range DescriptionThis species has a Palaearctic range, occurring principally in the lowlands of northern, central and eastern Europe plus southern Scandinavia extending eastwards into western Asia. It is widespread in Europe from Scandinavia to the Iberian Penisula, and from Eire to Ukraine and the species is still widespread within its known range. The full distribution in Europe is given in Fauna Europea (Bank et al. 2006): Norway, Sweden, Denmark (mainland), Finland, Estonia, Latvia, Lithuania, Kalingrad region (Russia), Poland, Republic of Ireland (Eire), Great Britain (UK), Northern Ireland (UK), Netherlands, Belgium, Luxembourg, France (mainland), Corsica (France), Germany, Switzerland, Liechtenstein, Austria, Czech Republic, Slovakia, Hungary, Italy (mainland), Bulgaria, Romania, Spain (mainland), Portugal (mainland), Albania, Croatia, Slovenia and Ukraine. Fauna Europea (Bank et al. 2006) note that it was reported from the former country of Yugoslavia so may be present in other countries.
There are records from Turkey and Iran, but according to Gloer and Pesic (2012), these records have been confused with another two newly described species, B. forcarti sp. n. or possibly with Bithynia mazandaranensis sp. n.
It is also introduced into North America. In North America the range now extends from Quebec and Wisconsin to Pennsylvania and New York (Kipp et al. 2013). Originally it was found in Great Lakes Region, first recorded in Lake Michigan in 1871, spreading to Lake Ontario, the Hudson River, and other tributaries and water bodies in the Great Lakes region during the 20th century.